US Bridges

Isabella Road over Spring Creek

Good

Isabella County, Michigan · .28 M S NE Cor Sec 14 T15 · Structure no. 000000000004361

Built
1978
47 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
192
2002 count
Owner
County
County Highway Agency

About this bridge

Isabella Road over Spring Creek is a prestressed concrete box beam or girders - multiple carrying Isabella Road over Spring Creek in Isabella County, Michigan. It was built in 1978, so it is 47 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 192 vehicles a day, projected to reach 234 by 2022. The structure is 36 ft (10.9 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIsabella Road
CrossesSpring Creek
Location.28 M S NE Cor Sec 14 T15
RouteCounty Highway 0
CountyIsabella County
StateMichigan
Coordinates43.69433, -84.74791
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.7 US tons
Inventory rating47.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length36 ft (10.9 m)
Longest span32 ft (9.7 m)
Deck width33 ft (10.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic192 (2002)
Projected traffic234 by 2022
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Isabella Road over Spring Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Isabella Road over Spring Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does Isabella Road over Spring Creek carry?

About 192 vehicles per day (2002 count).

How long is Isabella Road over Spring Creek?

The structure is 36 ft (10.9 m) long with a longest span of 32 ft (9.7 m) and a deck 33 ft wide.

Who owns Isabella Road over Spring Creek?

It is owned by the County Highway Agency.